Steam-engine.



fuzz-El- L. S. PUTMAN.

STEAM ENGINE.

, 1221.101110]! 11,311 JULY 13, 1910.

COLUMBIA PLANDGRAPH 60., WASHINGTON. D. C.

Patentd Sept. 5,1911.

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L. S. PUTMAN.

STEAM meme,

APPLIOATION FILED JULY 13, 1910. 1 002 449. Patented Sept. 5, 1911.

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S I Ell-110M0 \ZOLUMBIA I'LANOGRAFII C0. WASHINGTON. D. c.

LEWIS S. PUTMAN, 0F STACY, TEXAS.

STEAM-ENGINE.

Specification of Letters Patent.

Patented Sept. 5, 1911.

Application filed July 13, 1910. Serial No. 571,794.

To all whom it may concern:

Be it known that I, LEwIs S. PUTMAN, a citizen of the United States,residing at Stacy, in the county of McCulloch, State of Texas, haveinvented certain new and useful Improvements in Steam-Engines; and I dohereby declare the following to be a full,

clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains tomake and use the same.

The invent-ion relates to an improvement in steam engines and moreparticularly to the double cylinder type.

and are suitably connected to a common crank shaft, and improved valvemeans 10-" cated between the cylinders, for controlling the flow ofsteam to the cylinders.

With this and other objects in view the innying drawings disclosing thepreferred. form of embodlment of the invention and.

particularly pointed out in the appended claims. It is to be understood,however, thatchanges, variations and modifications may be resorted tosuch as come properly within the scope of the appended claims withoutdeparting from the spirit of the invention.

In the drawings: Figure 1 is a top plan view embodying the invention.Fig. 2 is a transverse sectional view on line 3-3 of Fig. 1. Fig. 3 is alongitudinal sectional view through the steam chest. Fig. 4: is adetailed perspective view of one of the slide valves.

Similar reference characters indicate corresponding parts throughout theseveral views in the drawings.

In the drawings, the numeral 10 designates the base or bed plate of thesteam en gine to the center of which is secured a pair of steamcylinders 11 and 12 having between the same a steam chest 13 the samebeing of the ordinary construction. At one end of the base or bed plateare secured bearings 15 in which is journaled a crank shaft- 16 the samehaving opposed cranks 18 and 19 the former having connect-ion withpitmen 20 which latter are pivotally connected to cross 3 heads 21slidably mounted in guide ways 22 and carried by the cross heads 21 arepiston rods 23 having the usual piston 24 working in the steam cylinder.

To the cranks 19 are connected pitmen 25 pivotally connected to crossheads 26 slidably mounted in guide-ways or blocks 27 and to the saidcross heads 26 are rigidly connected rods 28 the latter working inguides 29 projecting a distance from the outer faces of the cylinders.To the ends of the rods 28 are fixed sliding blocks or return heads 30WlllCll are slidably mounted in guide ways 31 arranged in alinement withthe guide The primary object of the invention is the construction of asteamengine having parallel cylinders in which opposed pistons work ways22 and on the opposite side of the cylinders with respect thereto. Tothe sliding :blocks or return heads 30 are connected pis- =ton rods 32having pistons 33 working in the cylinders toward and from the pistons24k therein.

The opposing sides of the cylinders 11 are provided with steam ports 34and 35 which communicate with the interior of each cylinder at oppositeends thereof and with the interior of the steam chest at opposite endsthereof. Below the steam chest 13 and leading therefrom is an exhaustport or pipe 36 the latter having communication with the interior ofsaid steam chest through out wardly diverging passages 37 the sameterminating at a point centrally between the steam ports 34 and 35 andin alinement therewith. At a point centrally of each steam cylinder 11is a steam port 38 leading therefrom to the steam chest opposite thecommunication of the steam ports 34: and 35 with the same and inalinement with the latter port.

On the crank shaft 16 are a pair of eccentrics 39 and 40 and which areconnected and adapted to actuate valve rods 41 and a2 in oppositedirections with respect to each other and which valve rods extendthrough one side wall of the steam chest for shifting the slide valves43 and 4:41: fixed to the said valve rods respectively and workingwithin the steam chest. The slide out off valves 43 and 14 movablymounted in the steam chest are each provided with an opening 4L5 whichextends entirely through the valve at a suitable distance from the frontend thereof and with a channel or groove 16 which is made in the valveon the side that bears against and slides on one face of the steamchest, this channel or groove being closed at its upper end and open atits lower end and'located immediately in rear of the opening 45 so as tohave the steam port 38 communicate with the passage'37 leading to theexhaust pipe from the steam'chest. On the opposite ends oif'the crankshaft 16 are driving wheels 47 .u wliere bythesteam engine can beutilized for driving machinery. Leading to the steam chest 13 is a steamsupply pipe 48.

The operation of the invention is as follows: While the pistons in thecylinder 11 are moved outwardly therein to their fullest extent thepistons in the other cylinder 12 are moved inwardly nearly in contactwith each other. The valve 44: is moved so as to have its opening 45register with the steam port 38 and the channel or groove 46 of the saidvalve is moved to form communication between the steam port 35 and theexhaust passage 37 so that steam will be admitted to the cylinder 12 todrivethe pistons therein in opposite directions and steam in the rear ofsaid pistons will be forced out through the exhaust port or pipe leadingfrom said steam chest. The valve 43 at this time has been shifted so asto have its opening 45 in register with the steam ports 85 whereby steamfrom the steam chest will be forced or admitted through the steamportions 35 in rear of the pistons in said cylinder 12 so as to drivethe same toward each other, and as they advance the exhaust of saidcylinder takes place through the steam port 38 having communication withthe exhaust passage 7 37 through the medium of the channel or groove 46in the slide valve. 7

What is claimed is 1. In a steam engine consisting of a pair of parallelcylinders, a plurality of pistons arranged in said cylinders, a steamchest arranged between said cylinders, a curved passageway connectingeach cylinder with said chest, a plurality of valves slidably arrangedwithin said chest, each of said valves being formed with a transverseinlet slot and an angular channel arranged to register with an exhaustpipe.

2. In a steam engine consisting of a pair of parallel cylinders, aplurality of pistons arranged in each cylinder, a valve chest arrangedbetween said cylinders, passageways connecting the central portion ofeach cylinder with said chest, a chamber arranged on either side of saidchest, passageways connecting each of said chambers with the endportions of its adjacent cylinder, a plurality to register with anopening formed in one of said chambers.

In testimony whereof, I afiix my signature, in presence of twowitnesses.

LEWIS S. PUTMAN. Witnesses O. B. JANETT, B. K. BOWEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

